Screw-driver.



UNITED STATES PATENT OFFICE.-

JOHN D. CAMPBELL, OF NEW YORK, N. Y.

SCREW-DRIVER.

ing is a specification.

My invention relates to screw-drivers, more particularly to that type forming the subject of an application filed by me March 27, 1903. Serial N 0. 149,7 7 7, employing pivoted nor:

' mallyspring-closed jawsslidableonthe driver- I blade, so as to adapt them to engage the head of a screw either before or after the blade is engaged with the notch thereof.

It has for its object the provision of means for giving strength and rigidity to the jaws, means for preventlng lateral movement of the blade, means for holding said pivots in place, and means for holding the jaw-closing spring in place, whereby a simple, strong, inexpensive, and eifective screw-driver is provided the parts of which can be easily and readily taken apartor assembled.

In the drawings, Figure 1 is a side view of my device. Fig. 2 is a side view of one of the jaws. Fig. 2 is a side view of the other jaw. Fig. 2 is a side view of the sleeve on which the jaws are pivoted. Fig. 2 is an end view of the sleeve. Fig. 3 is a side view of the leaf-spring for normally holding the jaws. closed. Fig. 3 is an end view of the leafspring. Fig. 4: is a side view of the driver- 'blade and handle with the other parts of the device removed. Fig. 5 is a side view of the .coil spring for normally holding the ends of the jaws above the lower end of the driverblade. Fig. 6 is a sectional view on the line 90 a? of Fig. 1.

Referring to the drawings illustrating my invention, in which like parts are designated by the same reference characters, 1 and 2 designate the hollow jaws, each of which is provided at a point intermediate its ends with longinwardly-extending ears 4 and 5, the ears of one jaw overlapping the ears of the other jaw and on account of their length giving strength and rigidity to the jaws. The lower end of each jaw is provided with an inwardlyextending portion or flange 6 for engaging the head of the screw, and said, portion 6 is provided with a notch 7, through which the shank of the screw projects, and the upper end of each jaw is provided with an inwardlyeXtending portion or flange 8. The jaws are Specification of Letters Patent.

Application filed February 1, 1905. Serial No. 243,658.

Patented Aug. 1, 1905.

supported on the shanks of headed pivot-pins 9, which project through holes 10 in a long, sleeve 11, located between the overlapping ears, and then through holes 12 in the upper ends of the ears. The driver-shaft 13, which is sharpened on its lower end for engagement with the notch of a screw, extends between the jaws and loosely through the long sleeve 11, so as to allow said sleeve to slide thereon for the purpose of allowing the lower ends of the jaws to be slid toward or from the end of the driverblade. The sleeve 11 serves to prevent sidewise movement of the driver-blade, and thereby always holds it centered between the jaws. For the purpose ofholding the lower ends of the jaws normally closed a leaf-spring 14 is provided with a central hole 15, through which the driver-blade loosely passes, and its ends 16 engage and are held in place by the inwardly-extending portions 8 at the upper ends of the jaws. For the purpose of normally holding the ends of the jaws above the lower end of the driver-blade a spiral spring 17 surrounds the upper end of the blade, its upper end bearing against the leaf-spring 14 and the lower end against a lug 18 on the blade.

It will be understood that the heads of the pivot-pins 9 come into contact with the driverblade and are thereby held in place.

It will be understood that any of the wellknown types of handles may be connected with thedriver-blade for driving or removing the screw.

The operation is as follows: To drive a screw, the jaws are slid down on the driverblade until the ends thereof are below the lower end of said driver-blade. The jaws are then opened, and the screw is inserted between them, so that the notch 7 engages the shank thereof. The driver-blade is pressed down until the lower end engages the notch of the screw, and it may then be driven home in the accustomed manner. To remove a screw, the jaws are slid up on the driver-blade until its end projects below their lower ends, when the screw may be engaged and partially removed in the accustomed manner until the head is well out. The jaws are then opened and slid down so that the notch 7 engages the shank of the screw, and the operation of removing the screw can then be completed.

I do not Wish to be understood as limiting myself to the precise details and arrangements of parts shown and described, but reserve the right to all modifications within the scope of my invention.

spiral spring for normally holding the ends of the jaws above the lower end of the driverblade, said spring surrounding said blade and being held between said lugs and the leafspring, substantially as described.

Signed at New York, in the county of New York and State of New York, this 31st day 01 January, A. D. 1905.

JOHN D. CAMPBELL.

. Witnesses:

CnAs. L. ow, M. BENDER. 

